7 worst sins in Islam:

(1)The greatest of these sins is shirk (associating others with Allah), which leads to doom with no hope of redemption, and if a person dies in this state he will abide in Hell for all eternity.

(1)Allah, may He be exalted, says:

“Verily, whosoever sets up partners in worship with Allah, then Allah has forbidden Paradise for him, and the Fire will be his abode. And for the Zalimoon (polytheists and wrongdoers) there are no helpers.”

[al-Maa’idah 5:72]

(2)Witchcraft involves shirk because it is worshipping the jinn and is seeking the help of the jinn to misguide people. Sometimes he does that by causing illusions to such an extent that a thing may be seen as something other than what it really is.

(2)Allah, may He be glorified, said concerning the sorcerers of Pharaoh (interpretation of the meaning):

“So when they threw, they bewitched the eyes of the people, and struck terror into them, and they displayed a great magic.”

[al-A‘raaf 7:116].

(3)Killing a soul whom Allah has forbidden us to kill. This is a serious crime killing a soul, or murder, is one of the most serious of crimes, but it is a major sin of a lesser degree than shirk (associating others with Allah).

(3)Allah says (interpretation of the meaning):

“And whoever kills a believer intentionally, his recompense is Hell to abide therein, and the Wrath and the Curse of Allah are upon him, and a great punishment is prepared for him.”

[an-Nisa’ 4:93].

(4)Consuming riba, this refers to dealing with riba which Allah has prohibited. Riba is of various kinds, Riba nasee’ah and Riba fadl:
- Riba nasee’ah: it is one of the gravest of major sins.
- Riba fadl: which means selling something for more of the same type or commodity.

(4)Allah, may He be glorified and exalted, says concerning it (interpretation of the meaning):

“Allah has permitted trading and forbidden Riba.”

[al-Baqarah 2:275]

(5)Consuming orphans’ wealth. The orphan is the one whose father has died when he is small and has not yet reached puberty. What is required in the case of orphans is to treat them kindly, protect their wealth, make it grow and handle it with proper care.

(5)The one who spoils the orphan’s wealth and consumes it unlawfully is subject to a stern warning, because the orphan is weak and he has transgressed against him and consumed his wealth. This stern warning is addressed to him, but he is not a disbeliever; rather he is a sinner.

(6)Fleeing from the battlefield. When the Muslims meet the disbelievers in battle, the one who flees and deserts his brothers on the day of battle, when the disbelievers march against the Muslims or the Muslims march against the disbelievers.

(6)The one who flees and deserts his brothers is subject to this stern warning (interpretation of the meaning):

“unless it be a stratagem of war, or to retreat to a troop (of his own).”

[al-Anfaal 8:16]

(7)Slandering chaste women is a major sin, as is slandering chaste men. Slandering chaste, innocent believing women.Which means accusing them of zina(fornication or adultery).This is one of the seven sins that doom one to Hell and for which one deserves to be given eighty lashes.

(7) Allah, may He be exalted, says (interpretation of the meaning):

“And those who accuse chaste women, and produce not four witnesses, flog them with eighty stripes.”

[an-Noor 24:4